Prosecutors had sought at least 14 years' jail and 12 strokes of the cane. The defence asked for 10 years' jail and six strokes of the cane.

Parties related to the victim are not named owing to a gag order to protect her identity.

Ong and the woman were at Zouk with friends. One of her friends had testified earlier that they were kissing, during which she was "standing up but wasn't very stable".

As the night wore on, she became intoxicated and passed out. The friend said that she trusted Ong when he said he would drive the victim home.

Meanwhile, the victim's boyfriend went in search of her when she failed to respond to his calls and text messages for hours. Logging into her Apple account and using the Find My iPhone app, he located her whereabouts.

He found her at about 6.30am, lying on a mattress with Ong.

Ong immediately denied he had done anything with her. She was wearing Ong's boxer shorts and T-shirt, and could barely open her eyes or stand.

Her family, suspecting she was drugged, took her to hospital. Later, a medical report, based on hospital test results, estimated her blood alcohol concentration to be between 210.50mg and 254.50mg per 100ml of blood when she was at Ong's home.

This means she was severely intoxicated and highly unlikely to have had consensual sex.

Her 57-year-old father, when testifying in court, broke down as he recounted how he had to break the news to his family, including his daughter, that she had been raped.

Ong, in his defence, said that he had been in an intimate relationship with the woman. He also claimed she was not so drunk and was able to consent to sex.

During sentencing yesterday, Justice Aedit Abdullah said that Ong had exploited the opportunity to be alone with the victim because the others thought he was taking her home.

The exploitation, however, did not amount to premeditation, the judge said, as there was no evidence that he had plied her with drinks.

Ong formed the intention to rape her after he drove off from the club, the judge added.

He noted that all rape victims suffer trauma but the psychological impact on the woman, while substantial, was not post-traumatic stress disorder, which would bring the case into a higher sentencing band.

The victim's father, who was in court, told reporters: "He deserves what he deserves."